rustc: Remove unused import

Author: brson

src/rustc/middle/ast_map.rs

@@ -3,7 +3,6 @@ import std::map::hashmap;
 import syntax::ast::*;
 import syntax::print::pprust;
 import syntax::ast_util;
-import middle::pat_util::*;
 import syntax::ast_util::path_to_ident;
 import syntax::ast_util::inlined_item_methods;
 import syntax::{visit, codemap};